The number of foreign students in the U.S. grew from about 663,000 in 2003 to more than 1.2 million in 2012. At least 26 foreign nationals in the U.S. on student visas have been arrested since Sept. 11, 2001, on terrorism-related offenses,yet in a shocking display of incompetence the Obama administration cannot account for thousands of student from countries with dangerous terror ties.